Muffler



Patented Appr. 8, 1924.

UNITED STATES PATENToFrlcE. l

JOHN J'. BRABANT, 0F SMITHTOWN BRANCH, NEW YORK.

MUFFLER. i

Application tiled November 10J 1919. Serial No. 338,848.

T o all whomz't may concern.' i

Be it known that I, JOHN J. BRABANT, a citizen of the United States, and a resident of Smithtown Branch, in the county of Suffolk and State of vented a certain new and useful Improvement in a Mufller, of which the following is a full, clear, and exact specification.

This invention relates more particularly to a class of devices adapted to be used in conjunction with combustion engines.

My invention has for its object primarily to provide a muffler designed to be employed for silencing the sound produced by the force of the discharges of combusted gaseous products exhausted from internal'combustion engines by causing the course of travel and velocity of the products from the engines to be checked and diverted in a manner whereby an effectual reduction of the Ipressure and elimination of sound at their nal liberation from the exhaust outlets will be obtained. This is accomplished essen` tially by providing a main chamber having an inlet adapted to be connected to the exhaust of an internal combustion engine as well as having an outlet for discharging the combusted gaseous products after passage through the chamber. Within the main chamber are spaced perforated chambers or baffles provided so that the stream of the products will be dissipated and diverted from a direct course through the main chamber, while on the main chamber are intake ports `whereby air will be forced into the main chamber for admixture with the gase' ous products by their suctional action during the flow through the main chamber, and in turn the sound resulting from the pressure of the velocity of travel of the products will be silenced by effectual reduction of the pressure.

A further object of the invention is to provide a muffler of a simple, eflicient and durable construction which may be made in any suitable shape and size. v

With these and other objects in view the invention will be hereinafter more fully de scribed with reference to the accompanying drawing forming a part of this specification in which similar characters of reference indicate corresponding parts in all the views, and will then be pointed out in the claim at the end of the description. f

In the drawing, Figure 1 is a fragmentary New York, have inview showin muflier em Fig. 2 1s a in perspective one form of ying my invention, and

fragmentary view showing a section taken on the line 2-2 of Fig. 1.

The device or muffler has a main chamber or shell 10 which may be of any suitable shape and size, though the chamber is pref erably of a form having a tapered cylindrical side wall 11 with larger end, and protruding from an opening in this plate is an inlet pipe 13 adapted to be lconnected to the exhaust port or pipe of an internal combustion engine, not shown, so that the combusted gaseous products from the engine will pass through the pipe into the main chamber 10. In the second end of the chamber 10 is a perforated outlet plate or baille 14, and this outlet' end of the chamber may be connectedto the delivery pipe, as 15, through which the exhausted products of combustion from the main chamber are finally discharged.

Interiorly of the main chamber or shell 10 between the inlet 13 and the outlet 14 are spaced perforated chambers or baflles,` as 16, 17, 18, which serve to dissipate and divert the course of the stream ofcombusted gaseous products when flowing through the main chamber from its inlet to its outlet. The baille chambers 17 and 18 are ypreferably of similar formations, each being composed of a substantially cone-shaped wall 19 with an opening 19l in its apex, while in the second end of the wall 19 of each of the chambers is a plate 20. In the plate 2O of each e chambers are spaced perforations 21. The ba-flle chamber 16 also has an approximately cone-shaped wall 22 with an opening in its apex from which protrudes a nib or tube 23 disposed toward the outlet 14 of the main chamber 10, while in the other end of the baille chamber `16 is a plate 24. In the plate 24 of the baflle chamber 16 are spaced perforations 25. The baille chambers 16, 17, 1,8 are arranged in the main chamber 10 so that their perforated plates 2O and 24 respectively are disposed across the passage through the chamber, and these baille chambers are soldered or otherwise secured to the side wall 11 of thechamber. The openings 19a as well as the passage of the tube 23 of these baille 'chambers are thereby disposed toward the perforated outlet or baflle 14 of the main chamber. When the gaseous products 0f combustion are exhausted from the a head plate 12 in its engine they will be admitted in the main chamber 10 through the inlet pipe 13, and the products will pass through the perforations of the plate 20 into the interior of the chamber 18, thence through the opening 19a of the baie chamber. The flow of the products of combustion will then be through the perforations of the plate 2O of the bathe chamber 1T into the interior of this chamber' and through the opening 19 of the vvall 19 of the baie chamber. From the battle chamber 17 the products of combustion vrill pass through the perforations of the plate 2O of the baffie chamber 16, thence into the interior of the chamber and through the tube 23 of the chamber for being exhausted through the perforated outlet4 plate or 1baiiie la of the main chamber into the final distribution pipe 15. The stream of the gaseous products passing through the main chamber will thereby be diverted from a direct course as Well as being dissipated for causing a reduction of the sound producing pressure of the products, and during the travel of the gaseous products the tendency of causing back pressure is overcome by the provision of air intake ports, as 26, 27, 28.

The intake ports are preferably of like formations, and each intake consists of a band 29 of approximately a cone-shape or funnel shape. The bands are arranged at spaced intervals on the exterior of the main chamber so that their reduced or apexed end parts surround the baie chambers 16, 17,

18 and so that their fiared open ends are disposed tovvard the inlet pipe 13 of the main through the main chamber,

chamber. rIChe apexed ends of the bands 29 are soldered or otherwise fixed to the side Wall 11 lof the main chamber 10, and the parts of the side vvall of the main chamber corresponding to the interior of the coneshaped bands are perforated, as at 30. During the travel of the products of combustion as above explained, a suetional actionwill occur, and in turn air will be drawn in the cone-shaped bands 29 as Well as through the perforations 30 of the side wall of the main chamber.

The currents of air will then mix with the dissipated products of combustion for further reducing the pressure of the products and silencing their sound producing force at their final liberation from the outlet pipe 15 of the mainchamber.

In the foregoing description, I have embodied the preferred form of my invention, but I do not vvish to be understood as Ylimiting myself thereto,` as I am aware that modifications may be made therein without departing from the principle or sacrificing an)7 of the advantages of this invention, therefore, I reserve t0 myself the right to make such changes as fairly fall Within the scope thereof.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In a muffier, the combination with a chamber having a tapered cylindrical wall perforated intermediate its ends and having in one of its ends an inlet as vvell as having in its other end a Wall with outlet perforations, of spaced substantially funnel shaped meinbers encircling the exterior of the perforated portion of the wall of the cylindrical chamber, and substantially cone-shaped chambers arranged in spaced relation across the interior of the perforated portion ot' the cylindrical chamber, said cone-shaped chambers having outlets in their apices disposed toward the outlet perforations of the end vvall of the cylindrical chamber and having perforations in the Walls of their bases.

This specification signed and witnessed this 8th day of November A. D. 1919.

JOHN J. BRABANT.

FREDERICK Cam. 

